Date	Rate
2011/5/26	0.325
2011/5/25	0.323
2011/5/24	0.324
2011/5/23	0.322
2011/5/20	0.321
2011/5/19	0.320
2011/5/18	0.322
2011/5/17	0.320
2011/5/16	0.320
2011/5/13	0.320
2011/5/12	0.323
2011/5/11	0.320
2011/5/10	0.320
2011/5/9	0.313
2011/5/6	0.310
2011/5/5	0.300
2011/5/4	0.300
2011/5/3	0.310
2011/4/29	0.300
2011/4/28	0.300